Abstract: An improved liquid flow meter for measuring moderate to low liquid flow rates with improved accuracy and minimal back pressure. The flow meter has a housing with two halves, a cover and a body, that fit together around a impeller so that liquid may flow and turn the impeller. Impeller performance is improved by use of a tapered inlet nozzle that increases liquid velocity while minimizing back pressure. Liquid is introduced tangent to the impeller by the tapered inlet nozzle to enhance initial impeller turning. The impeller registers the liquid flow by turning. The turning of the impeller is sensed electronically. Plenums are used for inlet and outlet flow to create regions of relatively consistent pressure regardless of duct location and orientation. The impeller fins are almost as wide as the impeller chamber to prevent liquid flow around the impeller. A magnet is encapsulated within the impeller that gives rise to a detectable electromagnetic flux when the impeller turns.